Machine for the manufacture of reenforced concrete pillars, high pressure tubes, and the like



July 19, 1932. J. SKORKOVSKY 1,868,393

MACHINE FOR THE MANUFACTURE OF REENFORCED CONCRETE PILLARS, HIGH PRESSURE TUBES, AND THE LIKE Filed July 15, 1950 6 i c 3 -4I:

:5 N 2 1 I v E I I E I I f. $2: s v////// Patented July 19, 1932 UNITED STATES PATENT OFFICE JAROSLAV SKORKOVSKY, F VINOHRADY, PRAGUE, GZEOHOSLOVAKIA, ASSIGNOR T0 JOHN FILLANS BARR, OF DROGHEDA, IRISH FREE STATE MACHINE FOR THE MANUFACTURE OF REENFORCED CONCRETE PILLARS, HIGH PRES- SURE TUBES, AND THE LIKE Application filed July 15, 1930, Serial 468,141, and in Czechoslovakia October 9, 1929.

The invention refers to a machine for the manufacture of reenforced concrete pillars, high-pressure tubes and the like. Machines of this kind are known in which the product is achieved by successively stamping and pressing of concrete, the necessary iron reenforcements being at the same time automatically mounted and twisted round, so that the product leaves the machine pressed in all layers with the reenforcements placed precisely. Such machines consist of a tubular mould with a core and of a rammer which moves in an annular opening between the outer wall of the mould and the upper end of the core. Fresh concrete is pressed into the pressing space when the rammer is lifted through the middle of the mould by means of a shaft provided with propellers and placed above the core. As however it is impossible to secure precise distribution of concrete over the whole annular opening, more concrete accumulates in certain places, so that the density of the stamped material and the consistence of the wall is not uniform. This is specially 2 disadvantageous in the manufacture of highpressure tubes.

The purpose of the present invention is to remove this disadvantage and to achieve com pletely uniformly tamped walls of tubes.

This purpose is achieved according to the invention by dividing the annular rammer into sectors which are carried by a common driving ring by means of resilient rods. The rammer can thus retreat resiliently in places in which more material is accumulated, since the respective sector compresses its spring and retreats with regard to the other sectors. In this manner a uniform action of the whole front surface of the rammer composed of sectors and a product perfectly uniform as to density of walls is achieved.

An example of the machine according to the invention is illustrated in the annexed drawing.

Fig. 1 shows a vertical axial section through the moulding part of the machine for the manufacture of hollow concrete bodies such as high-pressure tubes and the like,

Fig. 2 is a detail plan partly in section showing the tamper heads and inside wall of the mold.

Rammer 1 is guided in a cylinder 2 provided at one end with a mouthpiece 1 with a co-axial core-bar 3. Hammer 1 consists of several, for instance of six sectors, as shown in Fig. 2. The rammer is driven by a ring 5 which is connected with the sectors by means of resilient mounted rods 6. Furthermore the sectors are connected with the driving ring resiliently by means of spiral springs 8 which are inserted between the ring 5 and between nuts screwed on the rods 6. Ring 5 and sectors 1 are provided with openings 7 for the reinforcing iron rods which are to be embedded in the pillars, tubes and the like.

As the sectors 1 are resiliently placed on the driving ring 5 each sector is relatively slidingly movable with regard to the other sectors in the direction of pressure, so that the pressure is uniformly distributed over the whole front surface of the sector-ring independently of the non-uniform distribution of the concrete material introduced over the core-bar into the mould.

I claim 1. A machine for the manufacture of reenforced concrete tubes, pillars and the like comprising a number of sector shaped rammers, a cylindrical mould co-operating with said rammers and forming a guide therefor, a core bar inserted in said mould, a series of rods, one for each sector shaped rammer, a driving ring carrying and common to all said rods and resilient means supporting said rods on said driving ring.

2. A machine for the manufacture of reenforced concrete tubes, pillars and the like comprising a number of sector shaped rammers, a cylindrical mould co-operating with said rammers and forming a guide therefor,

a core barinserted in said mould, a series of rods, one for each sector shaped rammer, a driving ring carrying and common to all said rods, nuts mounted on said rods below said driving ring and a spring mounted on each of said rods, one end of said spring abutting against said nuts and the other end against said driving ring.

Intestimony whereof I have hereunto set my hand this twenty-sixth day of June, 1930.

JAROSLAV SKORKOVSKY. 

